I've only played 9 Man Regular SnG's and I would think that would be the most profitable. Generally speaking, I think Regular would be more profitable than Turbo because there's more time to maneuver, play poker, and exploit edges. I think 9 players is just a better sweet spot of players to deal with - more fish and people to fight against each other, pick your spots, switch gears, and the like, but not too many people so it's just one table. It's probably unique for each player, but that's my opinion for me and I would guess many others.

Generally speaking, I think cash games are the best money makers and tournaments are more fun